RINA GROUP is to verify the inter-operability and safety of the longest combined-traffic immersed tunnel in the world.The overall estimated value of the project is 5.5 billion Euros. The Fehmarnbelt Fixed Link will be 18 km long and will connect Denmark with Germany. International certification and classification society, the RINA Group, has been awarded a contract with the Danish company Femern A/S for the verification of the railway interoperability and safety requirements of the Fehmarnbelt Fixed Link. That is an underwater tunnel that will link Germany and Denmark.